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External Rotation at 0° Abduction (Side-Lying or Band)

Draftstrength95%beginner⬤ strong evidence

View FHIR resourceFHIR R4 ActivityDefinition — the interoperable form of this exercise

Positions & Range of Motion

Start: side-lying with the working arm on top, elbow bent 90° and tucked to the side over a towel roll, forearm resting across the abdomen
End: forearm rotated outward and upward to point away from the body, the elbow staying pinned at the side and the towel trapped throughout
Range of Motion: glenohumeral external rotation from ~0° (hand across the belly) to a comfortable end range, arm kept at 0° abduction

How to Perform

Rotator cuff strengthening targeting infraspinatus through external rotation with the arm at the side. Side-lying or standing with resistance band. Prevents superior humeral head migration and reduces impingement risk. Foundational for shoulder stability, progressible with resistance bands.

Watch on YouTube↗

Opens a YouTube search for “External Rotation at 0° Abduction (Side-Lying or Band)”

Equipment:resistance band

Starting position: sidelying

Coaching Cues

1
Quiet shoulder, tall trunk — rotation starts at the back of the cuff
(verbal)
2
Pull the band toward the doorway behind you
(verbal)
3
Rotate the wrist to point away from the body
(verbal)
4
Towel under the elbow stays trapped throughout
(tactile)

Evidence-Based Dosing & EMG Data

Recommended Dosing

3×8 at 8-RM, 3 days/week; 2-second eccentric

EMG Activation Data

Infraspinatus 62% MVIC, teres minor 67% MVIC, supraspinatus 24-37% [Reinold 2004]

Muscles Involved (5)

Primary Movers

Infraspinatus— Primary external rotator at 0° abduction

Teres Minor

Stabilizers

Supraspinatus— Humeral head depressor role

Lengthened / Stretched

Subscapularis— AUDIT: Dedicated external rotation directly elongates the primary internal rotator subscapularis.

Synergists & Assistors

Posterior DeltoidSynergist— Minimal contribution at 0° abduction

Easier Variations ↓

Active-Assisted ER with Cane

Use a cane or dowel to assist the motion with the other hand. Reduces load on the rotator cuff.

Side-Lying ER (Gravity Only)

Perform side-lying without additional resistance. Gravity provides the load.

Harder Variations ↑

Band ER at 0° (Heavier Band)

Progress resistance band color/thickness as strength improves. Maintain slow eccentric control.

90/90 External Rotation

Shoulder abducted to 90°, elbow at 90°. Rotate forearm up against resistance. Higher demand, sport-specific position.

Target Movements (1)

Shoulder External RotationGlenohumeral Joint

Why This Exercise Matters

Everyday activities this exercise helps you do — essential means it directly trains the capacity the task needs:

Reaching Overhead Sustained Overhead Work

Goals This Helps With

Rehab, performance, prevention, and mobility goals this exercise supports — essential means it's a cornerstone:

Rotator Cuff Tendinopathyrehab Subacromial Shoulder Painrehab Shoulder Injury Preventionprevention

Research Notes

EMG data: infraspinatus 62% MVIC, teres minor 67% MVIC, supraspinatus 24-37% MVIC [Reinold 2004]. Dosing: 3×8 at 8-RM, 3 days/week [Mulroy 2020]. Motor control exercises superior to nonspecific (SMD: -0.29 short, -0.33 medium term) [Lafrance 2024]. Perform in scapular plane to minimize superior humeral head migration [Mulroy 2020]. Control eccentric phase 2 seconds [Rodrigues da Silva Barros 2023].

Evidence Sources (6)

📄
Therapeutic Exercise: Foundations and Techniques— Kisner C, Colby LA, Borstad J
Therapeutic exercise foundations for External Rotation at 0° Abduction (Side-Lying or Band)
📄
ACSM's Guidelines for Exercise Testing and Prescription— American College of Sports Medicine
ACSM exercise prescription guidelines for External Rotation at 0° Abduction (Side-Lying or Band)
📄
A Primary Care Provider's Guide to Shoulder Pain After Spinal Cord Injury— Mulroy SJ, Hafdahl L, Dyson-Hudson T
A Primary Care Provider's Guide to Shoulder Pain After Spinal Cord Injury — evidence for External Rotation at 0° Abduction (Side-Lying or Band)
📄
Shoulder Muscle Activity and Function in Common Shoulder Rehabilitation Exercises— Escamilla RF, Yamashiro K, Paulos L, Andrews JR
Shoulder Muscle Activity and Function in Common Shoulder Rehabilitation Exercises — evidence for External Rotation at 0° Abduction (Side-Lying or Band)
📄
Electromyographic Analysis of the Rotator Cuff and Deltoid Musculature During Common Shoulder External Rotation Exercises— Reinold MM, Wilk KE, Fleisig GS, et al.
Electromyographic Analysis of the Rotator Cuff and Deltoid Musculature During Common Shoulder External Rotation Exercises — evidence for External Rotation at 0° Abduction (Side-Lying or Band)
📄
Progressive Exercise Compared With Best Practice Advice, With or Without Corticosteroid Injection, for the Treatment of Patients With Rotator Cuff Disorders (GRASP)— Hopewell S, Keene DJ, Marian IR, et al.
Progressive Exercise Compared With Best Practice Advice, With or Without Corticosteroid Injection, for the Treatment of Patients With Rotator Cuff Disorders (GRASP) — evidence for External Rotation at 0° Abduction (Side-Lying or Band)